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Weighted-Average Actual Target Allocation of Plan Assets (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017 | May 31, 2016
--- | --- | --- | ---
U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 100.00% |  |
Actual Asset Allocation |  | $ 487,233 | $ 437,481 | $ 314,216
Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 100.00% |  |
Actual Asset Allocation |  | $ 188,960 | 179,928 | $ 169,464
Equity securities | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 55.00% |  |
Actual Asset Allocation |  | $ 309,300 | 295,200 |
Equity securities | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 41.00% |  |
Actual Asset Allocation |  | $ 90,000 | 83,800 |
Fixed income securities | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 25.00% |  |
Actual Asset Allocation |  | $ 76,500 | 82,400 |
Fixed income securities | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 42.00% |  |
Actual Asset Allocation |  | $ 70,200 | 65,900 |
Multi-class | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 20.00% |  |
Actual Asset Allocation |  | $ 72,800 |  |
Cash | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actual Asset Allocation | [1] | 28,400 | 59,700 |
Cash | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actual Asset Allocation |  | 500 |  |
Real Estate | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actual Asset Allocation |  | $ 200 | 200 |
Real Estate | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target Allocation |  | 17.00% |  |
Actual Asset Allocation |  | $ 28,300 | $ 30,200 |
[1] | The cash position at May 31, 2018 results from our acceleration of the planned fiscal 2019 contribution, which was deposited into the RPM International Inc. Retirement Plan during February 2018. The cash position at May 31, 2017 results from our acceleration of the planned fiscal 2018 contribution, which was deposited into the RPM International Inc. Retirement Plan during May 2017.

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